Im new here and I want to know how to add a new game so i can speedrun it.
Also, you don't need to have a game on SRC to speedrun it. You can alway do speedruns at your own conditions, nobody is going to prevent that. SRC leaderboards provide a common platform for leaderboards, rules & documentation.
If you need to request a new game, check this link out: https://www.speedrun.com/knowledgebase/requesting-a-game You'll need to wait a few days to be able to request. Also be careful and read all the stuff in the guide.
Note that if your game is within a bigger game such as Minecraft or Roblox, there is a different location to request a leaderboard.
@susimper345 that's answered here in the FAQs https://www.speedrun.com/speedrunning/thread/pt010